package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Component
@Aspect
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) " +
            "&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut(){}

    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("进行公共字段自动填充");

        //获取方法上注解的value属性值
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取参数实体对象（默认是第一个参数）
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];

        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //反射方式执行方法
        try {
            Method setUpdateTime = entity.getClass().
                    getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().
                    getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
            if(operationType == OperationType.INSERT){
                Method setCreateTime = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
            }
        } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}
